An Elastic IP was assigned to EC2, and an ELK service was built in the EC2 instance. In the security group, we restricted the Kibana service on port 9000, and only allowed private addresses (VPC) in AWS VPC to access the Kibana service.
Now I need the Lambda function to access port 9000 through the EC2 private address, and the Lambda function can also access the contents of an S3 bucket when accessing through the EC2 private IP address.
How can I set this up?
Thank you!
The AWS Lambda function will need to be connected to the VPC. This will give it an Elastic Network Interface (ENI) with a private IP address.
To configure the security:
Create a Security Group for the Lambda function (Lambda-SG). Leave with default settings (Allow all outbound).
On the Security Group for the Kibana server, allow inbound connections on port 9000 from Lambda-SG (refer to it by name, then selecting it will insert the ID of the Lambda security group).
To allow the Lambda function to also access Amazon S3, choose one of the following:
Add a NAT Gateway to a public subnet and configure the Route Table of the private subnet (used by Lambda) to send 0.0.0.0/0 traffic to the NAT Gateway. OR
Add a VPC Endpoint for S3 to the VPC. This will route requests directly to S3 instead of going via the Internet Gateway.
Related
Is there anyone who can explain me that situation below ?
I connected to Ec2 intance in private subnet via Bastion Host.Then I created a vpc gateway endpoint to reach s3. I assigned the required role to ec2 and the connection to s3 is done. My question is, how can Ec2 instance in private subnet download something from the internet?
A VPC endpoint is used to access a certain service, in this case S3, over the AWS network instead of over the internet.
If you want your instance to be able to talk to the internet, you'll need to configure a NAT gateway in a public subnet, and you'll need to configure the route table of the private subnet to forward traffic to the NAT gateway.
A simple solution would be:
Put everything in a Public Subnet
Assign a Public IP address to the Amazon EC2 instance
Use Security Groups to secure access on the Amazon EC2 instance (that is, only allow Inbound connections from the Bastion)
The effective result is the same as using a Private Subnet, but the EC2 instance will be able to establish Outbound connections to the Internet (but not Inbound, so it remains secure).
As the title suggests, I placed my Lambda function in a private subnet and now It cannot access or timeout when scanning the DB. Prior to this, it could access and scan the DB. What should I do?
Your DynamoDB resources are not in your VPC. Since you've configured your Lambda functions to connect to your VPC, you need to setup a NAT Gateway or NAT Instance to allow your private resources to access the internet. As the docs state:
AWS Lambda uses the VPC information you provide to set up ENIs that
allow your Lambda function to access VPC resources. Each ENI is
assigned a private IP address from the IP address range within the
Subnets you specify, but is not assigned any public IP addresses.
Therefore, if your Lambda function requires Internet access (for
example, to access AWS services that don't have VPC endpoints), you
can configure a NAT instance inside your VPC or you can use the Amazon
VPC NAT gateway. You cannot use an Internet gateway attached to your
VPC, since that requires the ENI to have public IP addresses.
AWS Lambda Doc
Validate the following:
The route table for the Lambda has a NAT Gateway for internet traffic that resides in public subnet.
DynamoDB Gateway endpoint exists? Check its policy to ensure that it is not limited to specific sources
Outbound access is allowed via the security group and NACL
How can I create this scenario:
- A private subnet-1
- Lambda in subnet-1
- RDS in subnet-1(same subnet with Lambda)
- Both inside the same VPC.
is the above feasible and is it a good architecture ?
I have tried implementing it only issue is, it's timing out. But, when the Lambda is out of the subnet-1 it's working fine.
My understanding is since both RDS and Lambda are in the same subnet they should easily communicate.
It is perfectly okay to have Amazon RDS and the AWS Lambda function connected to the same private subnet.
Some things to note:
If the Lambda function also requires access to the Internet (eg to make calls to Amazon S3), then the VPC will also require a NAT Gateway in a public subnet.
The Lambda function should refer to the RDS instance by DNS Name. This should resolve to a private IP address local to the VPC.
The Lambda function should be assigned a Security Group (eg Lambda-SG)
The security group associated with the RDS instance (RDS-SG) should permit inbound access on the appropriate port (eg 3306 for MySQL) from Lambda-SG.
That is, RDS-SG should permit inbound connections from Lambda-SG.
I have this current Cloudformation config setup:
PasteBin example here
This runs a web app, there's also some networking config in there which routes outbound traffic through a nat gateway with an elastic ip.
--
Separately we have a manually created site-to-site VPN setup in AWS
screenshot, elastic ip created by cloudformation :
The other side of the VPN specified that our private ip range for the connection to work has to be in 192.168.242.0/24.
Also they have specifically whitelisted 192.168.242.230 at their end. Which is the private ip of the elasticip which the Cloudformation above created.
How can I establish a connection from my EBS ec2 instance to a server protected by this VPN? At the moment the connection just times out.
You would need to add a route table rule to allow traffic to X.X.X.X/X flow via the Virtual Private Gateway(vgw-xxxxxx)
Destination Target
x.x.x.x/x vgw-xxxxxx
I am trying to decrypt a file that is stored inside an S3 bucket using KMS. Within an EC2 instance, I am able to retrieve this file from S3, but when I try to decrypt it using KMS, I get the following error:
HTTPSConnectionPool(host='kms.us-east-1.amazonaws.com', port=443): Max retries exceeded with url: / (Caused by ConnectTimeoutError(, 'Connection to kms.us-east-1.amazonaws.com timed out. (connect timeout=60)'))
I am however able to decrypt this file successfully from my local machine. Does anyone know why this may be?
If additional info is required, I would be happy to provide it :)
When you enable VPC for your Lambda AWS shows you following message -
When you enable VPC, your Lambda function will lose default internet access. If you require external internet access for your function, ensure that your security group allows outbound connections and that your VPC has a NAT gateway.
So make sure your lambda has access to internet with correct security groups and NAT gateway.
Also note having IG for your subnet is not sufficient. You need to have a NAT instance or gateway and a route from your subnet to that gateway in route table for lambda to have internet access associated to a custom VPC.
AWS Lambda uses the VPC information you provide to set up ENIs that allow your Lambda function to access VPC resources. Each ENI is assigned a private IP address from the IP address range within the Subnets you specify, but is not assigned any public IP addresses. Therefore, if your Lambda function requires Internet access (for example, to access AWS services that don't have VPC endpoints, such as Kinesis), you can configure a NAT instance inside your VPC or you can use the Amazon VPC NAT gateway. You cannot use an Internet gateway attached to your VPC, since that requires the ENI to have public IP addresses.
Important :
If your Lambda function needs Internet access, do not attach it to a public subnet or to a private subnet without Internet access. Instead, attach it only to private subnets with Internet access through a NAT instance or an Amazon VPC NAT gateway.
Source : http://docs.aws.amazon.com/lambda/latest/dg/vpc.html
One case can be that you are connecting to s3 bucket using VPC endpoint and not have an internet connection.
If this is the case then you have to enable internet connectivity either via NAT or putting your instance in a public subnet.